Litotes:
Litotes
Metonymy
Synecdoche
"That does not surprise me."
The ship plowed through the sea.
"His parents bought him a new set of wheels [car]"
"The food was not bad."
The sails crossed the ocean.
"Use your head [brain] to figure it out."
"That was no big deal."
"Lend me your ear"
"Michigan [the government of Michigan] just passed a law addressing this problem."
"Don't fail me now!"
"Sweat" for "Hard work"
"The cutthroats [assassins] there will as soon shoot a man as look at him."
"She is not so unkind"
"Dish" for a course (in dining)
Could you pass me a Kleenex [facial tissue]?"
"She was not a little cross."
"Press" for news media
"No creature [person] would believe that story."
"You're not wrong."
"Tongue" for a language or dialect
"Those are some nice threads [clothes]."